serverless framework AWS pseudo parameters stack name - aws-cloudformation

Question

Question
What is the correct way to get the output of a cloudformation stack in a serverless.yml file without hardcoding the stack name?
Steps
I have a serverless.yml file where I import a cloudformation template to create an ElastiCache cluster.
When I try to do so, I get this error:
Serverless Error ---------------------------------------
Invalid variable reference syntax for variable AWS::StackName. You can only reference env vars, options, & files. You can check our docs for more info.
In my file I'd like to expose as an environment variable the ElastiCacheAddress output from the cloudformation stack. I am using the serverless pseudo-parameters plugin to get the output:
# Here is where I try to reference the CF output value
service: hello-world
provider:
name: aws
# ...
environment:
cacheUrl: ${cf:#{AWS::StackName}.ElastiCacheAddress}
# Reference to the CF template
resources:
- '${file(./cf/cf-elasticache.yml)}'
The CF template is the one from the AWS Samples GitHub repository.
The snippet with the output is here:
ElastiCacheAddress:
Description: ElastiCache endpoint address
Value: !If [ IsRedis, !GetAtt ElastiCacheCluster.RedisEndpoint.Address, !GetAtt ElastiCacheCluster.ConfigurationEndpoint.Address]
Export:
Name: !Sub ${AWS::StackName}-ElastiCacheAddress

Answer 1

You can use a workaround to get your way through these syntax caveats.
In this case, I would suggest you to create a custom node to set variables you would want to reuse. You can then reference these variables using Serverless Framework syntax only, to avoid that error, like so:
# Here is where I try to reference the CF output value
service: hello-world
custom:
stackName:'#{AWS::StackName}'
provider:
name: aws
# ...
environment:
cacheUrl: ${cf:${self:custom.stackName}.ElastiCacheAddress}
# Reference to the CF template
resources:
- '${file(./cf/cf-elasticache.yml)}'